package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放从begin到end范围内的每天的日志
        List<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end)) {
            // 日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dataList.add(begin);
        }

        // 存放每天的营业额数据
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dataList) {
            // 查询data日期对应的营业额数据，营业额是指状态为 “已完成” 的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where status=5 and between beginTime and endTime
            HashMap<String, Object> map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        // 封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dataList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 存放从begin到end之间每天对应的日期
        ArrayList<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dataList.add(begin);
        }

        //存放每天新增用户数量
        ArrayList<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量
        ArrayList<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dataList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            HashMap<String, Object> map = new HashMap();
            map.put("end", endTime);
            // 每天总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin", beginTime);
            // 每天新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dataList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     *
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 存放begin到end之间的每天对应的日期
        ArrayList<LocalDate> dataList = new ArrayList<>();
        dataList.add(begin);
        while (!begin.equals(end) && begin != null && end != null) {
            begin = begin.plusDays(1);
            dataList.add(begin);
        }

        // 存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天的有效订单数
        List<Integer> vaildOrderCountList = new ArrayList<>();

        // 遍历dataList集合来查询每天的有效订单数和订单总数
        for (LocalDate date : dataList) {
            // 查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            // 查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            vaildOrderCountList.add(validOrderCount);
        }

        // 计算时间区间内的订单总数量
        Integer totalOrdeCount = orderCountList.stream().reduce(Integer::sum).get();

        // 计算时间区间内的有效订单数量
        Integer vaildOrderCount = vaildOrderCountList.stream().reduce(Integer::sum).get();

        // 计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrdeCount != 0) {
            // 计算订单完成率
            orderCompletionRate = vaildOrderCount.doubleValue() / totalOrdeCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dataList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(vaildOrderCountList, ","))
                .totalOrderCount(totalOrdeCount)
                .validOrderCount(vaildOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量排名前10
     *
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> saleTop10 = orderMapper.getSaleTop10(beginTime, endTime);
        List<String> names = saleTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = saleTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        // 封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .numberList(numberList)
                .nameList(nameList)
                .build();
    }

    /**
     * 导出运营数据报表
     *
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {

        // 1. 查询数据库，获取营业数据 --- 查询最近30天的运营数据
        LocalDate dataEnd = LocalDate.now().minusDays(1);
        LocalDate dataBegin = LocalDate.now().minusDays(30);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(dataBegin, LocalTime.MIN)
                , LocalDateTime.of(dataEnd, LocalTime.MAX));

        // 2. 通过POI把查询到的数据写入到excel文件当中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            // 基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = null;
            excel = new XSSFWorkbook(in);

            // 获取表格文件的Sheet标签页
            XSSFSheet sheet = excel.getSheet("sheet1");

            // 填充数据 -- 时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dataBegin + "至" + dataEnd);

            // 获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate days = dataBegin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(
                        LocalDateTime.of(days, LocalTime.MIN)
                        , LocalDateTime.of(days, LocalTime.MAX));
                // 获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(days.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }

            // 3. 通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 4. 关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }

    /**
     * 根据条件查询订单数量
     *
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        HashMap<String, Object> map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }
}
